An organization is granted the block 130.56.0.0/16. The administrator wants to…

2022

An organization is granted the block 130.56.0.0/16. The administrator wants to create 1024 subnets.

Find first and last addresses of First subnet.

  1. A.

    130.56.0.0    130.56.254.254

  2. B.

    130.56.0.0    130.56.0.63

  3. C.

    130.0.0.0    130.255.255.255

  4. D.

    130.56.0.0    130.56.255.63

Attempted by 151 students.

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Correct answer: B

Solution: Steps to find the first subnet range when splitting 130.56.0.0/16 into 1024 subnets.

  • Start with the given network: 130.56.0.0/16.

  • Number of subnets required: 1024 = 2^10, so you must borrow 10 bits from the host portion.

  • New prefix length: 16 + 10 = /26.

  • Addresses per subnet: 2^(32 - 26) = 64 addresses (values 0–63 in the fourth octet).

  • First subnet range: network address 130.56.0.0 to broadcast address 130.56.0.63.

  • Usable host addresses in the first subnet: 130.56.0.1 through 130.56.0.62.

Answer: First subnet = 130.56.0.0 — 130.56.0.63 (usable hosts 130.56.0.1–130.56.0.62).

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